Cursors and FOR Loops

FOR loop can access the rows in a cursor without explicitly opening and closing the cursor.


CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
                  ENAME VARCHAR2(10),
                  JOB VARCHAR2(9),
                  SAL NUMBER(7, 2),
                  DEPTNO NUMBER(2));

INSERT INTO EMP VALUES (1, 'SMITH', 'CLERK',     800,    20);
INSERT INTO EMP VALUES (2, 'ALLEN', 'SALESMAN', 1600,    30);
INSERT INTO EMP VALUES (3, 'WARD',  'SALESMAN', 1250,    30);
INSERT INTO EMP VALUES (4, 'JONES', 'MANAGER',  2975,    20);
INSERT INTO EMP VALUES (5, 'MARTIN','SALESMAN', 1250,    30);
INSERT INTO EMP VALUES (6, 'BLAKE', 'MANAGER',  2850,    30);
INSERT INTO EMP VALUES (7, 'CLARK', 'MANAGER',  2850,    10);
INSERT INTO EMP VALUES (8, 'SCOTT', 'ANALYST',  3000,    20);
INSERT INTO EMP VALUES (9, 'KING',  'PRESIDENT',3000,    10);
INSERT INTO EMP VALUES (10,'TURNER','SALESMAN', 1500,    30);
INSERT INTO EMP VALUES (11,'ADAMS', 'CLERK',    1500,    20);

SQL> SET SERVEROUTPUT ON
SQL>
SQL> DECLARE
  2   CURSOR v_cursor IS SELECT empno FROM emp ORDER BY empno;
  3  BEGIN
  4  FOR v_emp IN v_cursor LOOP
  5      DBMS_OUTPUT.PUT_LINE(v_emp.empno);
  6  END LOOP;
  7  END;
  8  /
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PL/SQL procedure successfully completed.

SQL>
SQL>
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Cursors:
  1. Cursors
  2. Cursors and FOR Loops
  3. OPEN-FOR Statement
  4. Unconstrained Cursors
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